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Models of Coulomb-hadronic interference

Historically, there have been developed two approaches to calculate the effects of the interference between Coulomb and hadronic forces. Both are included in Elegent.

The Feynman-diagram approach is best represented by the work of West Yennie ​WEST, G. B. and YENNIE, D. R., Phys. Rev. 172 (1968) 1413-1422. In this publication there are two formulae derived: (full) West-Yennie formula (denoted WY) and simplified West-Yennie formula (denoted SWY). The latter was obtained in the approximation of purely exponential hadronic amplitude with constant phase. Therefore - strictly speaking - it is not compatible with most of the phenomenological models. It is included in Elegent for reasons of comparison - the SWY formula has been used extensively (at least) until recently.